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STOCK-BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 25, 2021
Sep. 26, 2020
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 22,023 $ 16,870 $ 52,289 $ 40,973
Provision for income taxes (3,155) (2,508) (7,607) (6,047)
Stock-based compensation, net of income taxes 18,868 14,362 44,682 34,926
Cost of revenue        
Stock-based compensation expense        
Stock-based compensation, before income taxes 3,818 3,261 9,543 7,616
Selling, general and administrative        
Stock-based compensation expense        
Stock-based compensation, before income taxes $ 18,205 $ 13,609 $ 42,746 $ 33,357